●
Best cooling efficiency of all known cooling methods ●
Allows an extremely compact high voltage switch design in connection
with excellent Pd(max) specifications ●
The absence of grounded heatsinks minimizes the stray capacitance
with the result of faster electrical rise time and lower
power losses at high
operating frequencies ● The DLC principle allows a very
homogenous cooling of the entire electronics of the switching module and
reduces significantly the thermal stress at cyclic load change.

"Intelligent" pump unit
with coolant reservoir and built-in
control electronics for the pump motor and possible external
radiator fans. Highly reliable design for professional purposes.
The pump housing / reservoir is
milled from a billet aluminum block and allows an absolute
leakage free operation also at high temperature and high
pressure. The front side of the unit, which is usually mounted
behind the front panel of a system housing (e.g. a 19 inch
housing unit), has an o-ring sealed viewing window for the
built-in flow turbine wheel. The flow turbine wheel serves as a
visual flow indicator and as digital flow sensor in the same
time. Double ball bearing in connection with optical scanning
guarantees a MTBF of several hundred thousand hours for this
safety relevant part component.

The built-in electronics
is monitoring the coolant flow, the tank fill level (also by
optical sensors), the coolant temperature, the motor function
and the supply voltage. The speed of the pump motor and the
speed of the externally connected radiator fans is regulated
proportionally to the coolant temperature. The automatic speed
control can be turned-off by a logic signal for full cooling
power or external speed control over the supply voltage, if
demanded.

In case of any fault condition (over
temperature, flow disturbance, empty reservoir, missing or
incorrect supply voltage etc.) a relay contact is immediately
released to protect the connected power electronics in the
cooling circle. For Behlke HTS high voltage switches, the alarm
contact (normaly closed contact) will simply be connected
between the "Inhibit" and the "GND" input of the switch control.
Any false or critical operating condition will also be
indicated by different color illuminations of the coolant, which
is visible through the viewing window. During normal cooling
operation the color of illumination is blue. Other colors are
available, to meet individual front panel design requirements.

If ordered with option "IHE" (internal heat exchanger),
the pump block with its plain milled surfaces can also be
utilized as a highly efficient heat exchanger / heat sink. With
the help of the option "IHE", the coolant heat can be
easily transferred via the housing block to an existing
heatsink. This can be a classical heatsink or any large massive
metal housing (e.g. a 19 inch housing with thick front panel) or
a large metal chassis of a machine. A cooling solution with
option "IHE" allows a power dissipation of at least 500 Watt
without active radiators.

The maximum cooling capacity
with sufficient active radiators is approx. 3000 Watt for the
standard pump unit and approx. 5000 Watt in connection
with the power option "30W".

The option
"EFSI" (extra features for system integration) includes an
additional optocoupler output (open collector), a digital flow
signal output and an integrated coolant temperature sensor
according to customers specifications (PT100, KTY, NTC etc.)

- Threated inserts,
metric, d = 5 mm (M5) on bottom, right side, rear side and front
side for heatsink attachment (8 threaded inserts on each
side). Alternative attachment by a flange
plate. Flange and sufficient M5 screws are included in supply.
The plastic spacer on front side can be removed, if
the viewing window shall be in line with a front panel plate.
Please ask for a modified window thickness, if your front plate
has an unusual thickness.

Housing block with cooling fins for secondary air cooling.
Recommended In connection with option IHE. Cooling
fins can be attached on the rear side and / or the right side of the
housing block. Heat resistance down to 0.2 K/W per side (forced
air convection, air velocity >4 m/s).

Pressure proof cooling boxes for the integration of non-DLC
components, such as classical power electronic components and
peripheral circuit boards, into a DLC cooling system. The
standard cooling box program is based on a 40 mm grid. Any x-y
enlargement can be realized in steps of 40 mm up to the maximum
available length (inner dimension 944 mm, outher dimension 974
mm, see data sheet for detailed information). Customized DLC
cooling boxes in any dimension up to 1000 x 750 x 120 mm³ with
any kind of electrical feedthrus in any position are available.
Please contact us for further information. The cooling
boxes have an inner height of 25 mm (1'') and are ideal for
printed circuit boards. The inner height can optionally be
increased or reduced. The housings have at least 3 threaded
holes G1/4 on each side (only 2 on the front / rear side for
size A...). The G1/4 threads are used for the hose connectors
and for the electrical standard feedthrus. Two hose connectors
and screw caps are included in the supply. Electrical feedthrus
must be ordered separately. The standard housings are
made from Delrin and Makrolon. PEEK, PVC and Aluminum are
optionally available.

Electrical Feedthrus for DLC Cooling Boxes
The standard feedthru program includes various standard sockets
(BNC, BNC-HT, SHV-NIM, LEMO, etc.) as well as multiple single
ended wires (up to 13 wires per feedthru). Any other customized
feedthru can be realized. Board connectors with several hundred
pins are possible.